Spring Integration运行示例

SimpleFlowApplication.java

package sia5;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.core.env.Environment;

@SpringBootApplication
public class SimpleFlowApplication {

    public static void main(String[] args) {
        SpringApplication.run(SimpleFlowApplication.class, args);
    }
    
    @Bean
    public CommandLineRunner writeData(FileWriterGateway gateway, Environment env) {
      return args -> {
        String[] activeProfiles = env.getActiveProfiles();
        if (activeProfiles.length > 0) {
          String profile = activeProfiles[0];
          System.out.println("profile:" + profile);
          gateway.writeToFile("simple.txt", "Hello, Spring Integration! (" + profile + ")");
        } else {
          System.out.println("No active profile set. Should set active profile to one of xmlconfig, javaconfig, or javadsl.");
        }
      };
    }
    
}

 

FileWriterGateway.java

package sia5;

import org.springframework.integration.annotation.MessagingGateway;
import org.springframework.integration.file.FileHeaders;
import org.springframework.messaging.handler.annotation.Header;

@MessagingGateway(defaultRequestChannel="textInChannel")
public interface FileWriterGateway {

  void writeToFile(
      @Header(FileHeaders.FILENAME) String filename,
      String data);
  
}

 

FileWriterIntegrationConfig.java

package sia5;

import java.io.File;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;
import org.springframework.context.annotation.Profile;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.annotation.Transformer;
import org.springframework.integration.dsl.IntegrationFlow;
import org.springframework.integration.dsl.IntegrationFlows;
//import org.springframework.integration.dsl.channel.MessageChannels;
import org.springframework.integration.file.FileWritingMessageHandler;
import org.springframework.integration.file.dsl.Files;
import org.springframework.integration.file.support.FileExistsMode;
import org.springframework.integration.transformer.GenericTransformer;

@Configuration
public class FileWriterIntegrationConfig {

  @Profile("xmlconfig")
  @Configuration
  @ImportResource("classpath:/filewriter-config.xml")
  public static class XmlConfiguration {}
  
  @Profile("javaconfig")
  @Bean
  @Transformer(inputChannel="textInChannel",
               outputChannel="fileWriterChannel")
  public GenericTransformer<String, String> upperCaseTransformer() {
    return text -> text.toUpperCase();
  }

  @Profile("javaconfig")
  @Bean
  @ServiceActivator(inputChannel="fileWriterChannel")
  public FileWritingMessageHandler fileWriter() {
    FileWritingMessageHandler handler =
        new FileWritingMessageHandler(new File("/tmp/sia5/files"));
    handler.setExpectReply(false);
    handler.setFileExistsMode(FileExistsMode.APPEND);
    handler.setAppendNewLine(true);
    return handler;
  }
  
  //
  // DSL Configuration
  //
  /*@Profile("javadsl")
  @Bean
  public IntegrationFlow fileWriterFlow() {
    return IntegrationFlows
        .from(MessageChannels.direct("textInChannel"))
        .<String, String>transform(t -> t.toUpperCase())
        .handle(Files
            .outboundAdapter(new File("/tmp/sia5/files"))
            .fileExistsMode(FileExistsMode.APPEND)
            .appendNewLine(true))
        .get(); 
  }*/

}

 

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <artifactId>simple-flow</artifactId>
  <name>simple-flow</name>
  <description>simple-flow</description>
  
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.7.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
  </parent>

  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-integration</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.integration</groupId>
      <artifactId>spring-integration-file</artifactId>
    </dependency>
    
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

 

运行配置如下：